Now, it shows a picture of 3 gases, and it says count the INDEPENDENT particles. So:

**Answer 1**

Consider a particle to be

a single unconnected ball

2 balls together count as a single particle (these are the diatomic particles.)

3 balls together count as a single particle.

Using those definition of particles

count the total number of particles = T

count the total number of diatomic particles = D

Total pressure = 0.810atm x [T/D]

Or you could think about it like

0.810atm / D = the pressure per particle.

pressure per particle x # particles = total pressure.